Petersburg, Alaska Climate

United States

Pop. 2,948 Elev. 11 m / 36 ft TZ: America/Sitka (UTC-8) ·

Petersburg has cool summers with average highs of 67°F (19°C) in August, and frigid winters averaging 18°F (-8°C) in December. Wind chill can push winter lows to 11°F (-12°C). Rain falls on about 146 days per year (111.3 in / 2827 mm total), with snow on 28 days and 158 in (4014 mm) of annual accumulation. The city averages 39 sunny days per year and around 60 thunderstorm days. Ocean water temperatures reach 54°F (12°C) in summer.

Temperature 67°F (20°C) high 18°F (-8°C) low
Feels like 11°F (-12°C) low
Rain 146 days 111.3 in (2827 mm) /yr
Snow 28 days 158.0 in (4014 mm) /yr
Sky 39 sunny 60 stormy
Wind 3.2 mph (1.4 m/s) avg

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Monthly Climate Chart

↓ Monthly data table
Best months to visit: Jul, Aug

Sky & Air by Month

Cloud cover (%)
86
Jan
62
Feb
75
Mar
84
Apr
88
May
82
Jun
78
Jul
72
Aug
85
Sep
83
Oct
87
Nov
77
Dec
Humidity (%)
82
Jan
74
Feb
76
Mar
77
Apr
81
May
78
Jun
80
Jul
81
Aug
84
Sep
86
Oct
86
Nov
79
Dec

Weather Days by Month

↓ Weather days table

Water Temperatures

↓ Water temperatures table

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Nearby Cities

Nearby

Commercial airport 1 mi Petersburg James A Johnson Airport (PSG)
Ski resort 116 mi Eaglecrest Ski Area
National park 15 mi Beecher Pass State Marine Park
Mountain peak (5,059 ft) 19 mi Fighting John Peak
Hospital 0 mi Petersburg Medical Center
Hiking trail 89 mi Indian River Trail

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Monthly Weather Data

↑ See chart
Month Avg High Avg Low Rainfall Snowfall Sunny Days
January 39°F 4°C 32°F 0°C 7.5 in 190 mm 42.1 in1070 mm 2
February 34°F 1°C 21°F -6°C 5.7 in 145 mm 8.1 in206 mm 11
March 44°F 7°C 34°F 1°C 4.8 in 122 mm 25.4 in644 mm 3
April 50°F 10°C 39°F 4°C 9.3 in 237 mm 3.7 in94 mm 0
May 52°F 11°C 44°F 7°C 15.6 in 396 mm 0.3 in7 mm 0
June 60°F 16°C 50°F 10°C 6.2 in 156 mm 4
July 65°F 18°C 55°F 13°C 7.7 in 196 mm 2
August 67°F 20°C 55°F 13°C 7.8 in 197 mm 5
September 60°F 16°C 50°F 10°C 17.3 in 439 mm 2
October 49°F 10°C 41°F 5°C 13.9 in 353 mm 3.3 in83 mm 4
November 41°F 5°C 35°F 2°C 8.0 in 202 mm 16.2 in410 mm 1
December 27°F -3°C 18°F -8°C 7.6 in 192 mm 59.0 in1499 mm 5

Weather Days by Month

↑ See chart
Month Sunny Days Storm Days
January 2 3
February 11 1
March 3 1
April 0 4
May 0 8
June 4 3
July 2 4
August 5 4
September 2 10
October 4 8
November 1 6
December 5 8

Water Temperatures Data

↑ See chart
Month Ocean Avg High Lake Avg High
January 41°F 5°C 32°F 0°C
February 39°F 4°C 32°F 0°C
March 40°F 4°C 33°F 1°C
April 42°F 6°C 39°F 4°C
May 46°F 8°C 44°F 7°C
June 51°F 10°C 50°F 10°C
July 53°F 12°C 57°F 14°C
August 54°F 12°C 62°F 16°C
September 53°F 12°C 57°F 14°C
October 46°F 8°C 46°F 8°C
November 44°F 7°C 38°F 3°C
December 42°F 6°C 33°F 1°C